Investigation ofN23in a three-body model

Abstract

The neutron-drip-line nucleus 23 N is investigated in a three-body model consisting of a 21 N core and two valence neutrons. Using the Faddeev formalism with the realistic neutron-neutron potential and the neutron-core potential, we calculate the ground-state properties of 23 N including its twoneutron separation energy, and obtain good agreement with the experiments. We also find an excited 23 N state with a shallow two-neutron separation energy at about 0.18 MeV. By evaluating the root-mean-square matter radii, the average distances between the two valence neutrons, and the average distances from the core to the center-of-mass of the valence-neutron pair, we show that the excited state of 23 N has a distinct halo structure. Through calculating the correlation density distributions of the 23 N three-body system in configuration space, we find that the excited state of 23 N has a triangular shape, which is similar to but much more extended than the ground state.This scaling symmetry between the ground and excited states indicate the existence of an Efimov state in 23 N.

Two-neutron halo state of 15 B around 3.48 MeV by a three-body model

“…We find that the energy of the 3/2 − 2 state decreases gradually as K max increases, affected a bit more significantly by the K truncation compared with the ground-state energy. Therefore, in our calculation, we take K max = 22 to do our best to relieve the impacts of the K truncation, which is also consistent with other calculations on core + n + n systems (see, e.g., [16,21]).…”

Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases

“…This is the essential distinction from the ordinary zero-momentum pairing. Though there is a lack of prominent evidences in condensed-matter physics, various schemes have been proposed to synthesize and demonstrate this unconventional state in ultracold Fermi gases by using artificial fields [15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”